<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title></title>
	<style type="text/css">
		.box{
		 	width: 400px;
		 	height: 400px;
		 	margin: 50px auto;
		 	display: flex;
		 	flex-wrap: wrap;
		 }
		 .box div{
		 	width: 0;
		 	height: 0;
		 	border: 100px solid green;
		 }
		 .box div:nth-child(1){
		 	border-color: transparent transparent blue transparent;
		 }
		 .box div:nth-child(2){
		 	border-color: transparent transparent transparent red;
		 }
		 .box div:nth-child(3){
		 	border-color: transparent yellow transparent transparent;
		 }
		 .box div:nth-child(4){
		 	border-color: green transparent transparent transparent;
		 }
		 .box:hover{
		 	transform: rotate(36000deg);
		 }
	</style>
</head>
<body>
	 <div class="box">
	 	<div></div>
	 	<div></div>
	 	<div></div>
	 	<div></div>
	 </div>
</body>
</html>